This study describes the gas-sensing properties of a La 2 CuO 4 /yttria-stabilized zirconia ͑YSZ͒/Pt potentiometric sensor and discusses its sensing mechanism in terms of the adsorptive and catalytic behavior of the electrode materials. The sensor is highly sensitive to NO, CO, and NO 2 , but virtually no response is observed for CO 2 and O 2 detection. Optimal NO sensing is obtained at ϳ450°C. Above 500°C, there is an abrupt decrease in sensitivity. Below 400°C, there is a saturation of the response. The sensor is NO selective against O 2 , but its sensitivity is affected significantly by CO 2 and CO. This selectivity behavior is in good agreement with temperature-programmed desorption results, indicating that the NO response is very likely adsorption-related. For example, the NO chemisorption peak disappears in the presence of CO 2 , which agrees with the sensor results showing a significant decrease in the NO sensitivity by CO 2 addition even though CO 2 itself shows no sensor response.

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